Improvement in piano-locks



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@fitta A. F. PFEIIFER, OF NEWARK, NEWJERSEY.

Letters Patent No. `87 ,196, dated February 23, 1869.

'IMPROVEMENT IN PIANO-LOCKS.

The Schedule 'referred to in these Letters Patent and making part of thesame.

*MoH- To all whom it ma/y concern:

Be it known that I, A. F. PFEIFER, of Newark, in

the county of Essex, and State of INew Jersey, have` invented a new 'anduseful Improvement in Locks; and I do hereby declare that the followingis a full, clear, and exact description thereof, which will enable thoseskilled in the art to make and use the same, reference heilig had to theaccompanying drawings, forming part of this specification, in which thegure is a side view of my improved lock, the inner case-plate beingremoved.

My invention has for its object to furnish a cheap, simple, andeffective lock,;designed especially for pianolocks, sewingfmachinecases, and similar uses; and

It consists in the combination of one or more hook or catch-bolts withthe straight or lsliding bolt of the lock, the whole being constructedand arranged as hereinafter more fully described.

A is the case of the lock, about the construction of which there isnothing new.

B is the straight bolt, which slides out and in, in a vertical line, andthe movement of which is limited by the stop-pin C, rigidly attached tothe case A, and which passes through a slot in the middle part ofthebolt B, seas to limit the movement of the said bolt,- and at the sametime compel it to move always in a straight line.

Upon one edge of the rear part of the bolt B, is

formed a notch, into which the key enters, to throw the bolt forward andback.

The bolt B is secured or locked in both positions by the slotted tumblerD, which is pivoted at the rear end to the case A, and is -held forwardagainst the pin or projection b', formed upon or attached to the bolt B,by the spring E, one end of which is attached to the rear end of thetumbler D, and the other orffree end of which rests against the stop-pinF, attached to the. case A, or against the side of said case.

The spring E holds the tumbler D forward, both when the bolt B is thrownout and when it isldrawn in, so that the notches formed at' the ends ofthe slot in said plate, may take hold of the pin b', and hold the bolt Bsecurely in position until released by pushing the tumbler D back.

The tumbler D is pushed back to allow the bolt B to be moved forward orback, by the key, one of the guards of which strikes the edge of saidtumbler, and

pushes it back before the key reaches and acts upon the bolt B.

To an ear or shoulder formed upon one or both the side edges of the boltB, is pivoted the rear end of' the hooks or catches G, so -that the saidhooks or catches may be Amoved forward and back by the movement of thebolt B.

g are projections, formed upon the outer sides of the catches Gr, which,as the said catches G are pushed forward, and have almost reached theirlimit, strike against the stop-pins H, rigidly attached to the case A,which causes the forward or hooked end of the said catches G to beprojected sideways, so as totake hold of thel keeper-plate I, attachedto the lid or cover which is to be secured, the bolt B preventing thesaid lid orrcover from lateral movement when locked.

. In unlocking the lock, the stop-pins H press against edges 'with thehooked arms g', adapted to catch uuder the pins H, in the lock-case, asherein described, for the purpose specified.

' A F. PFEIFER.

Witnesses:

OLIVER R. SMITH, G. SANDFORD.

